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Fix perf issues discovered in "For software performance, can you always trust inlining" blog #61408

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merged 9 commits into from
Dec 7, 2021
Merged

Fix perf issues discovered in "For software performance, can you always trust inlining" blog #61408

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a433102
Make Vector128.Create more expensive, enable call opcode resolution i…
EgorBo Nov 10, 2021
1673244
Remove dead code
EgorBo Nov 10, 2021
72fb64e
Merge branch 'main' of https://github.com/dotnet/runtime into fix-lem…
EgorBo Nov 15, 2021
dddf349
Merge branch 'main' of https://github.com/dotnet/runtime into fix-lem…
EgorBo Nov 17, 2021
4f4c709
Merge branch 'main' of https://github.com/dotnet/runtime into fix-lem…
EgorBo Dec 1, 2021
80897b4
fix typo
EgorBo Dec 1, 2021
3368ff2
fix build issue
EgorBo Dec 2, 2021
bd38782
Merge branch 'main' of https://github.com/dotnet/runtime into fix-lem…
EgorBo Dec 7, 2021
8967fce
Update gentree.cpp
EgorBo Dec 7, 2021
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2 changes: 1 addition & 1 deletion src/coreclr/jit/fgbasic.cpp
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Expand Up @@ -893,7 +893,7 @@ void Compiler::fgFindJumpTargets(const BYTE* codeAddr, IL_OFFSET codeSize, Fixed
unsigned retBlocks = 0;
int prefixFlags = 0;
bool preciseScan = makeInlineObservations && compInlineResult->GetPolicy()->RequiresPreciseScan();
const bool resolveTokens = preciseScan && (isPreJit || isTier1);
const bool resolveTokens = preciseScan;
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// Track offsets where IL instructions begin in DEBUG builds. Used to
// validate debug info generated by the JIT.
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31 changes: 28 additions & 3 deletions src/coreclr/jit/gentree.cpp
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Expand Up @@ -3948,10 +3948,12 @@ unsigned Compiler::gtSetEvalOrder(GenTree* tree)
costSz = 2 * 2;
break;

#if defined(FEATURE_HW_INTRINSICS) && defined(TARGET_XARCH)
#if defined(FEATURE_HW_INTRINSICS)
case GT_HWINTRINSIC:
{
if (tree->AsHWIntrinsic()->OperIsMemoryLoadOrStore())
GenTreeHWIntrinsic* hwTree = tree->AsHWIntrinsic();
#if defined(TARGET_XARCH)
if (hwTree->OperIsMemoryLoadOrStore())
{
costEx = IND_COST_EX;
costSz = 2;
Expand All @@ -3964,9 +3966,32 @@ unsigned Compiler::gtSetEvalOrder(GenTree* tree)
goto DONE;
}
}
#endif

switch (hwTree->gtHWIntrinsicId)
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Do we need to review costing for HW intrinsics more broadly?

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We likely should. We probably aren't accounting for cases where helper intrinsics are more expensive than they appear nor cases where operands have less cost due to special handling that hardware intrinsics get.

There's also probably cases where operands (like scalar DBL_CNS) are currently participating in overall CSE and shouldn't for certain cases.

{
#if defined(TARGET_XARCH)
case NI_Vector128_Create:
case NI_Vector256_Create:
#elif defined(TARGET_ARM64)
case NI_Vector64_Create:
case NI_Vector128_Create:
#endif
{
if (hwTree->gtGetOp1()->OperIsConst() && (hwTree->gtGetOp2() == nullptr))
{
// Vector.Create(cns) is cheap but not that cheap to be (1,1)
costEx = 2;
costSz = 2;
}
break;
}
default:
break;
}
}
break;
#endif // FEATURE_HW_INTRINSICS && TARGET_XARCH
#endif // FEATURE_HW_INTRINSICS

case GT_BLK:
case GT_IND:
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